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_aWiersma, William. _95759 |
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_aResearch methods in education : An introduction / _cWilliam Wiersma |
| 250 | _a5th ed. | ||
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_aLondon : _bAllyn and Bacon, _c1991 |
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_a443 p. : _bill |
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_aEducation _xResearch. _95756 |
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